By Rami Rosen
Linux Kernel Networking takes you on a guided in-depth journey of the present Linux networking implementation and the idea at the back of it. Linux kernel networking is a fancy subject, so the booklet will not burden you with themes ultimately on the topic of networking. This publication also will no longer overload you with bulky line-by-line code walkthroughs indirectly concerning what you are looking for; you will find simply what you wish, with in-depth factors in every one bankruptcy and a short reference on the finish of every chapter.
Linux Kernel Networking is the one updated reference advisor to figuring out how networking is applied, and it'll be integral in years yet to come for the reason that such a lot of units now use Linux or working platforms in accordance with Linux, like Android, and because Linux is so frequent within the information middle enviornment, together with Linux-based virtualization applied sciences like Xen and KVM.
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Additional resources for Linux Kernel Networking: Implementation and Theory
Sample text
The method is called when the local machine initiates sending an ICMPv6 message under conditions described in this section. There is also the icmpv6_echo_reply() method, which is called only as a response to an ICMPV6_ECHO_REQUEST (“ping”) message. The icmp6_send() method is invoked from many places in the IPv6 network stack. This section looks at several examples. Example: Sending “Hop Limit Time Exceeded” ICMPv6 Messages When forwarding a packet, every machine decrements the Hop Limit Counter by 1.
H). c) 31 Chapter 2 ■ Netlink Sockets Each protocol that wants to add a socket monitoring interface entry to this table first defines a handler and then calls sock_diag_register(), specifying its handler. dump = unix_diag_handler_dump, }; The second step is registration of the handler: static int __init unix_diag_init(void) { return sock_diag_register(&unix_diag_handler); } Now, with ss –x or ss --unix, you can dump the statistics that are gathered by the UNIX diag module. c). There’s also a diag module for the netlink sockets themselves.
I discuss this more in the next section. Creating and Sending Generic Netlink Messages A generic netlink message starts with a netlink header, followed by the generic netlink message header, and then there is an optional user specific header. Only after all that do you find the optional payload, as you can see in Figure 2-5. Figure 2-5. Generic netlink message. h) 29 Chapter 2 ■ Netlink Sockets • cmd is a generic netlink message type; each generic family that you register adds its own commands.
